Duplex pumping-engine.



No. 050,509. Patented May 29, I900. H. KESSLEB.

DUPLEX PUMPlNG ENGINE.

[Application filed May 9, 1899.)

(No Model.)

mmm

m: uonms PETERS coy. PHOYO-LITHQ, WASHINGTON, o. z:v

sir-TE HENRY KESSLER, OF SAN FRANCISCO, CALIFORNIA.

DUPLEX PUMPING-ENGINE.

SPECIFICATION forming part of Letters latent No. 650,509, dated M y 2 1900- 'Applioation filed 45 9,1899.

To whom it may concern.-

Be it known that I, HENRY KESSLER, a citizen of the United States,'residing in the city and county of San Francisco, State of California, have invented an Improvementin Duplex Combined Pumping-Engines; and I hereby declare the following to be a full, clear, and exact description of the same.

My invention relates to improvements in pumping-engines of that class known'as the duplex engine, in which the movement of the piston of one of the engines is utilized to actuate the valves of the other.

My invention consists of the parts and the constructions and combinations of parts hereinafter described and claimed.

.Referring to the accompanying drawings, Figure 1 is a view of a duplex pumping-engine,showin g the relative position of the mechanism. Fig. 2 is a transverse section illustrating my invention.

In order to effectively employ the compound engine in a pumping apparatus known as the duplex, it is necessary first to admit directly into the low-pressure cylinder until the apparatus has been started, and it is then nec essary to cut off this supply, so that the steam will thereafter be exhausted from the highpressure cylinder into the valve-chamber of the low-pressure cylinder, thence operating on the piston in that cylinder, and finally be: ing exhausted, and in order to compensate for any condensation or other action which may reduce the pressure too low a compensatingvalve is interposed which will be automatically operated by the steam pressures upon opposite sides, so that in the case mentioned a supply of steam may be admitted to the lowpressure cylinder direct from the high-pressure-valve chamber, and when the pressure is relatively properly proportioned in the two this valve will be automatically closed, thus establishing a ratio of pressure in the low-pressure cylinder to correspond with that in the high-pressure. As shown in my present construction, A is the high-pressure and B the low-pressure cylinder placed side by side, having pistons movable therein and the piston-rods extendingoutward through the heads and connecting with the pump-cylinder pis; tons in the usual manner known in that class of pumps. Each cylinder has its own valvechalnber andvalve, and the valves are alternately moved in one cylinder by the movement of the piston-rod in the other cylinder through a lever connection, as shown at G. In the present inventionD is the valve-chamber of the high-pressure cylinder A, and E is the valve-chamber of the low-pressure cylinder B.

Fixed with suitable relation to the low-pres sure valve-chamber is a supplemental-valve chamber F. This chamber may be made of any suitable or desired shape and may be located in any convenient or desired position with relation to the low-pressure cylinder. In the present case I have shown it as a cylindrical chamber situated above the valve-cham ber E and secured upon the top of said cham-- ber, as shown. Through the cover of this valve-chamber is a port or opening G, con-' necting the chamber F with the main-valve chamber E of the low-pressure cylinder. The valve-chamber F is made of two differentsizes, corresponding in proportion with the proportions of the cylinders A and B.

H II represent a valve or piston fitted to slide within the valve-chamber F. The part II of the valve is made to fit the upper and smaller portion of the valve-chamber F and the part H the lower and larger portion. The valve is here shown as made hollow, the lower edges being adapted to seat upon the top of the valve-chamber E and inclosing the steam port G.

I is a steam-pipe connecting the valve-chamber D with the upper part of the chamber F, and at the point of connection the pipe divides into two passages, one of which opens into the cylinder opposite the side of the upper part II of the valve. The valve-chamber has an annular channel made around its interior at this point, as shown at J, so that'steam admitted through the branch I will enter this annular chamber. The other branch I opens into the cylinder above the upper end of the valve H, and the. effect of this construction is to press the valve II II down until it is seated upon the top of the valve-chamber E. The upper part of the valve H has ports K made in its side which coincide with the anand this allows the steam passing through the pipekl into the annular'channel J to enter nular channel J when the valve is thus seated, I

sure will act upon the valve H H and force it up, and by reason of the greater area of the lower part of the valve it will overcome the pressure through the pipe I and will'ra'ise the valve until connection through the passage 1 and ports K is cut off. Any decrease of pressure within the cylinder B, caused by condensation or other action, which would cause a disproportionate pressure in the two cylinders will be immediately compensated, be-

cause the superior pressure of steam through.

the passage 1 will force the piston down again, and thus bring the passages K in positionto admit live steam into the low-pressure cylinder. The instant that the pressure is brought up to the proper degree the valve ,will again be forced up'and cut off these ports. The action is thus automatic, and the pressure within the two cylinders is constantly maintained at the desired ratio.

A coiled spring L is shown within the lower part of the valve H, the office of which is to partially balance the Weight of the valve when it stands in a vertical position, as here shown, and to soften the force of the seating when the valve is forced downward by pressure from above.

O is a passage connecting the space above the larger part of the valve II with the exhaust-passage For" the low-pressure cylinder. This passage is necessary when the low-pressure cylinder connects with the condenser, because under such conditions the vacuum in the condenser has the effect to change the ratio of pressure between the two cylinders, and this passage serves to equalize the pressure by its direct connection with the condenser.

7' Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is-

1. Ina cross compound duplex pumpingengine, the combination of high and low pressure cylinders and steam-distribution Valves therefor, means whereby the high-pressure valve is controlled by the movement of the low-pressure side, and vice versa, passages connecting the exhaust of the high-pressure cylinder with the steam-chest of the low-pressure cylinder, an equalizer controlling the pressure between the high and low pressure steam-chests, and steam connections between the equalizer and said chests.

2. In a compound pumping-engine, the combination of high and low pressure cylinders and steam-distribution valves therefor, the high-pressure valve being controlled by the movement of the low-pressure side, and vice versa, an independent valve-chamber, an equalizing-valve movable therein and having areas of pressure exposed to the high and the low pressure cylinders and proportioned to correspond with the proportions of the cylinder, a steampassage connecting the high pressure steam-chest with the smaller part of the equalizing-valve chamber, and a second passage through which steam is admitted to pass the equalizing-valve and enter the low-pressure steam-chest.

3. A cross compound duplex pumping-engine including high and low pressure cylinders and steam-distribution valves therefor, means whereby the high-pressure valve is controlled from' the low-pressure side, and vice versa, an equalizing-valve movable in'a chamber and having areas corresponding to the proportions of the cylinders, the larger area being exposed to the low cylinder-pressure and the smaller area to the high cylinderpressure, a passage connecting the steamchest of the high-pressure steam-distribution valve with the smaller end of the equalizing valve chamber, a second passage opening into the side of the equalizing-valve chamber, and ports made through the equalizing-valve and adapted to be alined with said second passage when the valve has been moved to the end of its travel by high-pressure steam, and cut off from connection when pressure from the lowpressure side has moved the valve in the op posite direction.

4. In apumping-engine, high and low pres sure cylinders having pistons and steam-distribution valves, the valve of eachcyl-inder beingactuated by the piston movement of the other cylinder,'a passage connecting the exhaust of the high-pressure cylinder with the valve-chamber of the low-pressure cylinder, a valve-chamber having two diameters, the larger diameter connecting with the steamchest of the lower pressure and the smaller diameter with the steam-chest of the highpressure cylinder, a valve havi-ng'correspondingly-dilterent diameters fitting and slidable within said chamber with passage therethrough by which steam is normally allowed to pass into the valve-chamber of the low-pressure cylinder, a supplemental passage by which steam from the high-pressure-valvo chamber is admitted above the smaller end of the supplemental valve and connection between the exhaust of the low-pressure cylinder and a condenser.

5. In a pumping-engine, high and lowpressure cylinders having pistons-and steain distribution valves, the valve of each cylinder being actuated by the piston movement of the other cylinder a passage connecting the exhaust of the high-pressure cylinder with-the valve-chamber of the low-pressure cylinder, a valve-chamber having two diameters, the larger diameter connecting with the steamchest of the low-pressure cylinder and the smaller diameter with the steam-chest of the high-pressure cylinder, a valve having correspondingly-difierent diameters fitting and slidable within said chamber with passage therethrough by which steam is normally allowed to pass into the valve-chamber of the low-pressure cylinder, a supplemental passage by which steam from the high-pressurevalve chamber is admitted above the smaller end of the supplemental valve, and a passage connectin g the larger part of the supplemental- 10 valve chamber with the passage leading from the low-pressure exhaust to the condenser.

In witness whereof I have hereunto set my hand.

HENRY KESSLER. Witnesses:

S. H. Nounsn, JEssIE G. BRODIE. 

